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// Test that macros can be defined in the labeled block. This should not trigger an error about
// statements not being allowed in that position, and should of course work as expected.
//@ run-pass
#![allow(incomplete_features)]
#![feature(loop_match)]
enum State {
A,
B,
C,
}
fn main() {
let mut state = State::A;
#[loop_match]
'a: loop {
state = 'blk: {
macro_rules! const_continue {
($e:expr) => {
#[const_continue]
break 'blk $e;
};
}
match state {
State::A => {
const_continue!(State::B);
}
State::B => {
// Without special logic, the compiler believes this is a
// reassignment to an immutable variable because of the
// `loop`. So this tests that local variables work.
let _a = 0;
if true {
const_continue!(State::C);
} else {
const_continue!(State::A);
}
}
State::C => break 'a,
}
};
}
assert!(matches!(state, State::C))
}
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